The tanks that will stop playing because of the foretelling doom and gloom of hyperbole and overreaction are likely the tanks that probably shouldn’t have been playing tanks anyways while the tanks that do keep playing will still enjoy fast queue times for matchmade content as they always have.
I’ll just keep DPSing as usual, if the world becomes so dire that forum players predict 99% of all tanks will vanish being true, I’d just pick up and tank on my BDK alt and be the hero to repopulate the world (of warcraft queues).